HEALTHCARE VENTILATION Heading Construction Specification


Double metal or composite skin with sandwiched insulation to “Euroclass A” fire rating


Smooth internal surface without channels or ridges


No projecting spire or tech screws inside the unit


Internal Surface Finish


Non-corrodible, washable, and smooth, and of a colour that allows accumulations of dirt to be easily seen


Thermal Transmittance Thermal Bridge Deflection


Factory airtightness – pre-delivery Site airtightness test


Filter frame bypass leakage Supply and extract intake and


discharge isolation dampers Access doors


BS EN 1886 Class T2 BS EN 1886 Class TB2 BS EN 1886 Class D2 BS EN 1886 Class L2 BS EN 1886 Class L2 BS EN 1886 Section 7 BS EN 1751 C3 (low loss)


Secured from casual access. Fan chamber doors to be fitted with a two-stage latch


Specific fan power – internal (SFPint)


Specific fan power – system (SFPsyst) Energy recovery


Current Eco design requirement for energy-related products (ErP)


UK Building Regs Current ErP


EU1253


Stainless steel or white powder-coated mild steel or with an equivalent


protective treatment; but NOT surface galvanised


Manufacturer’s declaration Manufacturer’s declaration Manufacturer’s factory test Test at +700 Pa and -400Pa +700 Pa/-400 Pa


Motorised opening and fitted with an end switch and spring return


Key or similar device required to open access doors. Door hinges should be


adjustable so that leakage can be eliminated on site


EU 1253 – 2014 Part L2


Run-around coil – 68% Heat pipes – 73%


Plate heat exchanger – 73% Thermal wheel – 73% Heat pump – EU 2281/201 Any other device – see standard


Table 1: HTM 03-01 Part A Table 8 – Plant minimum standard.


the ‘value-engineered’ alternative is still compliant. The result is that well-meaning facilities management people, consultants, and facility providers, might believe they are engaging with a well-informed supplier and purchasing HTM 03-01 compliant equipment, but for the sake of some upfront budgetary savings, are significantly compromising on the validity of their plant, and – more importantly – the quality of their indoor air. To be clear, we are not saying that


everyone is doing this, and we are not even saying this moving away from the regulations is being deliberately deceitful. What we are saying is that we have seen it happen, and we have seen clients not realise they are non-compliant, or not know what to look for when it comes to being compliant or varying from the HTM, so here we have offered an analysis of what actually constitutes ‘compliant’, where the shortcuts more often occur, and what to look out for.


52 Health Estate Journal October 2023 With this knowledge, clients can then


make a more informed decision about: n What air quality is right for their facility. n What areas they are willing to compromise on.


n Is their facility HTM 03-01 compliant or not?


The bottom line The harsh reality of the HTM 03-01 (2021) update for the activity of the organisations – such as NHS Trusts – that fall under its guidance, is that to be fully compliant, there will be budgetary implications, due to the need to employ high-quality materials, time-consuming processes, and ongoing maintenance costs. That said, knowing the improvements and benefits to be gained from improved air quality, it is very much a case of ‘you get what you pay for’, and when it impacts healthcare, it is hard to find a compromise. If you are specifying ‘HTM 03-01 (2021)-compliant’, our first


recommendation is to request documentation to demonstrate conformity with the points listed in Table 1, which is extracted from the HTM, and shows the minimum standards that plant needs to adhere to be considered suitable for use within a healthcare environment. Below the table we consider some of these points and how to be compliant, what shortcuts we have seen, and why we see them.


Construction – Fire rating Construction of an air-handling unit can really vary, and make a significant difference to performance, efficiency, and safety. A key factor here this the fire rating of the materials used, and what standard they adhere to. HTM 03-01 states that all panels should be insulated to Euroclass A fire rating. The Euroclass system determines a product’s fire performance by measuring a comprehensive set of characteristics, including ignitability, flame spread, heat release, smoke production,


Comments


Note: Capping projecting spire screws is not acceptable


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